The Rule of Five (Adding Move Semantics)

Hard Design Patterns & Final Challenges PRO

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Problem Statement

Expand the `Buffer` class to include Move Semantics (Rule of Five). Implement the Move Constructor (`Buffer(Buffer&&)`) and Move Assignment (`operator=(Buffer&&)`). Steal the pointer and set the source’s pointer to `nullptr`. Print ‘Move Constructor’ and ‘Move Assignment’. In `main()`, use `std::move()` to test them.

Input Format

A single integer.

Output Format

Print the move operations trace.

Constraints

None

Sample Input

Sample Output

Move Constructor
Move Assignment

Explanation

Move semantics optimize C++ by transferring resources from temporary objects instead of making deep copies, completing the modern C++ Rule of Five.

Starter Code

#include <iostream>
#include <utility>

class Buffer {
    int* data;
public:
    Buffer(int v) : data(new int(v)) {}
    ~Buffer() { delete data; }
    // Omit prints for copy constructor and assignment to isolate move tests
    Buffer(const Buffer& o) : data(new int(*o.data)) {}
    Buffer& operator=(const Buffer& o) { if(this!=&o) *data = *o.data; return *this; }
    
    // Implement Move Constructor and Move Assignment here
};

int main() {
    // Setup variables and apply std::move()
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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